(-)-(3R,4S)-3-acetoxy-4-[(S)-2,2-dimethyl-1,3-dioxolan-4-yl]-1-(2-propynyl)-2-azetidinone 在
copper diacetate 、
potassium carbonate 作用下,
以
乙腈 为溶剂,
反应 5.0h,
以100%的产率得到[(2S,3R)-1-[6-[(2S,3R)-3-acetyloxy-2-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]-4-oxoazetidin-1-yl]hexa-2,4-diynyl]-2-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]-4-oxoazetidin-3-yl] acetate